nodejs学习
npm install -save knex
const {dbconfig} = require('../config/index');
const knex = require('knex')({
client: 'mysql',
connection: dbconfig,
log: {
error (message) {
console.log('[knex error]', message)
}
}
})
class Base{
//查询
all (tableName,where,who){
return knex(tableName).where(where).select(...who)
}
// 新增
insert (tableName,params){
return knex(tableName).insert(params);
}
// 更改
update (tableName,id, params){
return knex(tableName).where('id', '=', id).update(params);
}
// 删除
delete (tableName,id){
return knex(tableName).where('id', '=', id).del();
}
//查询双表
selectab(aobj,bobj){
return knex({ a:aobj.name, b:bobj.name})
.select({
auser: `a.${aobj.out}`,
bupload: `b.${bobj.out}`
})
.whereRaw('?? = ??', [`a.${aobj.where}`, `b.${bobj.where}`])
}
}
// 测试------start
// let db = new Base()
//1、select
// db.all('user',{id:'33'},['name']).then(res=>{
// console.log(res);
// }).catch(e=>{
// console.log(e);
// })
//2、insert
// db.insert('user',{name:'lisa',password:'123456'}).then(res=>{
// console.log(res);
// }).catch(e=>{
// console.log(e);
// })
//3、update
// db.update('user',36,{name:'jenny'}).then(res=>{
// console.log(res);
// }).catch(e=>{
// console.log(e);
// })
// 4、delete
// db.delete('user',35).then(res=>{
// console.log(res);
// }).catch(e=>{
// console.log(e);
// })
// 5、selectab
// db.selectab({name:'user',out:'name',where:'relation'},{name:'upload',out:'name',where:'id'}).then(res=>{
// console.log(res);
// }).catch(e=>{
// console.log(e);
// })
// 测试------end
module.exports = new Base();
node utils/knex.ts
npm i winston
根目录添加一个配置打印日志格式的文件 logger.js,文末有github地址,内参考logger.js
const { createLogger, format, transports } = require('winston');
const fs = require('fs');
const path = require('path');
const env = process.env.NODE_ENV || 'development';
const logDir = 'log';
// Create the log directory if it does not exist
if (!fs.existsSync(logDir)) {
fs.mkdirSync(logDir);
}
const filename = path.join(logDir, 'results.log');
const logger = createLogger({
// change level if in dev environment versus production
level: env === 'production' ? 'info' : 'debug',
format: format.combine(
format.label({ label: path.basename(process.mainModule.filename) }),
format.timestamp({ format: 'YYYY-MM-DD HH:mm:ss' })
),
transports: [
new transports.Console({
format: format.combine(
format.colorize(),
format.printf(
info =>
`${info.timestamp} ${info.level} [${info.label}]: ${info.message}`
)
)
}),
new transports.File({
filename,
format: format.combine(
format.printf(
info =>
`${info.timestamp} ${info.level} [${info.label}]: ${info.message}`
)
)
})
]
});
module.exports = logger;
app.js内请求错误处理的部分删掉,更改为打印日志
const logger = require('./logger')
app.use(function(err, req, res, next) {
logger.error(`${req.method} ${req.originalUrl} ` + err.message)
const errmsg = err.message
res.status(err.status||500).json({
code:-1,
success:false,
message:errmsg,
data:{}
})
});
参考: